Carbureter.



W. R. PEMBROKE.

CARBURETER.

APPLICATlON FILEDYJUNE 4. |914.

Patented Dec. 12, 1916.

. TMNT CARBURJETER.

Specication of Letters Patent.

Patented Dec. 12, 191113,

Application led J une t, 1914. Serial No. 843,073.

To all 'whom t may concern:

Be it known that I, 1WlmurJLD P. PEM- BROKE, of Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Carbureters; and I do hereby declares the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the reference-numerals marked thereon.

My present invention relates to internal combustion engines and more particularly to charge forming devices therefor and it has for its object to provide a simple and efiicient carbureter in which air and gas will bev properly mixed and promptly supplied in just the right quantity according to the demands ofthe engine, whether at high or low speeds, the regulation of the quantity being automatically effected to a nicety 'at all times and independently of the use of the ordinary vpuppet valve. Provision is also made for adequately priming the engine in an effective manner and to these and other ends, the invention consists in certain improvements and combinations of parts all as will be hereinafter more fully described, the novel features being pointed out in the claims at the end of the specification.

In the drawing the ligure is a sectional view of a carbureter constructed in accordance with and illustrating one `embodiment of my invention.

While it will be understood that my improvements are alike applicable to compound carbureters or those of the type in which air or gas or both air and gas are admitted or mlxed at a plurality of points, or even applicable as to some function to air admission openings alone, I have shown the improvements in the present instance, as embodied in a simple carb'ureter having single air and gas admissions to a single mix- .mg chamber. In this view and referring l more particularly to the drawing, 1 indicates, in the present instance, a gasolene:

fuel supply pipe leading through a needle valve 2 to a float chamber 3 containing a float 4 connected up as usual or in any preferred manner to control the said valve, a pet cock l5 being vprovided to drain the chamber when required. The function of these parts is the usual one, namely, to maintain a proper normal level in a fuel jet 6 to which tbe gasolene flows .through a connection 7. rIhe jet may be litted with the usual needle valve control 8 and is so shown.

Supported on an extension 9 of the cover 10 for the float chamber 3 is the carbureting chamber 11 which chamber, in the present instance, is tubular in form. Its eduction opening may be considered its upper end 12 where it leads, beyond the butterfly or thot tle..control 13 to the vacuum chamber (not shown) maintained in communication vwith the engine cylinders. The'lower end of the chamber is also open at 13 which constitutes the induction opening. Arranged in spaced relation to the said last mentioned opening so as to regulate its capacity is an air deiiecting member 14 which member is preferably annular and cup-shaped, being threaded upon the fuel jet 6 and supported thereby. v

A sleeve 16 is threaded at 16 into the induction end 13 of the chamber 11 and guided in this sleeve is a tube 17 into which the fuel jet Ggprojects and which is preferably provided with a long internal flare 18 at the top and a shorter flare 19 at the bottom in the manner of a Venturi tube. Its lower end projects toward but is normally held spaced from the bottom of the air deflecting cup 14 by reason of a flange 20 at its upper end that rests upon the sleeve 15. The tube 18 is preferably made very light asl of aluminum, so that it will vibrate up and down (within the limitations of the sleeve and an upper shoulder 21 between which the flange 20 thereof is confined) as a result of variations inthe pressure within the carbureting chamber 11 and the rush ing in of a correspondingly greater or less volume of air at the lower end 19 between. it and the member 14.

The tube is shown in its normal position and that which it will ordinarily maintain while the engine is at low speed and demanding a minimum of air. When the pressure in the -mixing chamber decreases with a correspondingly increased pressure of the atmospheric air to enter the induction opening due to the further demands' of the engine, the tube 17 will be sucked up within the chamber, increasing the separation from the cup 14 and allowing the rapid influir a greater volume of air. subsides, aswhen the engine goes ba a lowspeed, the tube drops again of its o .n TF.;

weight and restricts the induction opening correspondingly.

W hen the demand can be regulated and particularly its. normal or low speed position. By4 adjusting the cup 14 up or down on the jet 6, these regulations may be urthered and the extent ofl maximum opening enlarged or increased.

-It will therefore be seen that between the two adjustments, provision may be made for any desired capacity at any pointin the operation. For instance, withI the parts in the positions shown,l by lowering the f cup 14, only,` the minimum opening is enlarged but the latitude of movementof the tube 17 remains the same, while by lowering both the cup and sleeve 15 to the same degree, the minimum opening remains the same but the maximum openingis increased as the latitude of movement of the tube 17 is increased, and so on. Lock nuts 22 and 23 may be provided for the sleeve 15 and the cup 14, respectively. -f

I also make provision for7 flooding the carburetor When itis desired to prime the engine. For this purpose, an operating rod 24 i s carried by -the float 4 and projects through the cover 10 to the exterior where it is accessible to the operators -lingers. Upon depressing this roch'the float 4 is submerged, displacing enough of the normal body of asolene in the chamber 3 to overflow the uel jet 6 and fill theV cup 14 toa point above the end of the tubol?, thus sealing the latter. When the suction from the cylinders causes a rareiicationand drop in pressure in the chamber 11, thisoverflowed quantity of fuel is projected in a body up intofthe chamber by atmospheric pressure and infront, of the inrush'ing air. The peculiar shape which I give to the bottom yof the cup or air fle-- fleeting member 14 aids in properly directlng this prlming charge andi-also creates proper currents in the air that is drawn..

in for ordinary mixing purposes. l To these ends, the cup has a raised centralportion 25. The interior wallsfslope down abruptly at 26 from the rim of the cup and thence rise at 27 at a less abrupt angle toward the ccnter. The abrupt slope at 2G and thel relativelyelevated rim also prevent the carbureter from emitting whistling noises which it would otherwise-be apt to .do bccause of the air impinging upon kthe lip of the tube 17 which has vsomewhat the `form of the lip of a steam whistle. The flare at the same time gives sul'licient' room for the flow' of air in the' reojuir-gd quantities..

I claim as my invention: A 1. 1n a carburetor, the combination with a carbureting chamber andan `au detlectlng membervarranged in spaced relation to the @induction end thereof and adjustable toward 1 j'cting from said end of the chai y 55 the 1rl deflectme member and ada-ated to and fromthe latter, of a vibratm1 tube prorierl tmvarrl be actuated by pressure variations in the carbureting chamber and means for regulating the amplitude of movement of the tube. l

2. In a carburetor, the combination with a carbureting chamber and a cup-shaped air deflecting member arranged in spaced relation to the induction end thereof, of a vibratory tube projecting from said end of the chamber into the cup-shaped'air deflect- -ing member and adapted to be actuated by pressure variations in the carbureting chamber, said tube constituting the sole air intake passage to the carbureting chamber.

3. ln a carbureter, the combination with a carbureting chamber and an annular air deilecting member arranged'in spaced relation to the induction end thereof, of a vi-y bratory tube projecting from said end of the chamber toward the air deflectingy member and adapted to be vactuated byI pressure` variations in the carbureting chamber,y and a fuel jet pojectino--int'o the tube, the air deflecting member round the fuel jet below and' independently4 of the discharge opening therein and' being adjustable thereon toward and from the tube. 4 I i Ll. In a carburet'er, th'e combination with a carbureting chamber and an air deflecting member larranged in spaced relation to the induction end thereof, of a vibratory tube projecting from said end of the chamber toward the air delecting member and adapted 4to be actuated by pressure variations in the carbureting chamber and means for regulating the latitude of movement of the tube, said tube. constituting the sole air intake passage to the carbureting chamber.

In a carburetor, the combination with a carbureting chamber and an air dclccting member arranged in spaced relation to the induction end thereof, of a vibratory tube projecting from said end of the chamber toward the air deflectiug mcmbcr and adapted to be actuatedy by pressure variations in the carbureting chamber, means for regulating the latitude of movement of the tube and means for adjusting the fixed position of the air dcflecting member tovard or away from the tube,

In a carlmrctcr, the combination with a` carburetng chamber and an air dcllcctiug member arranged in spaced relation to tbc `induction end thereof, of a sleeve threaded for adjustment in said end of tbc chamber, and avibratory tube guided in tbc slcevc to projecty toward the air delecting member `and adapted to be actuated by pressure vari- 7.111 a carburetor, the combination with eing arranged to surthe rim and thenre'bess nlnfuptLv upward t0- wurd the center. r

VHNFHCLD P. PEMBROKE.

Witnesses RUssELL B. Grmwrrn, NELSON H. Curr. 

